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Old 08-21-2011, 11:53 AM   #1 (permalink)
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DIY Muffler options for triangulated rear question.

I have my muffler off of my tj right now and I hate that my jeep sounds like a damn ricer. I want it to sound like it did stock, or close to it. What are my options for a shorter exhuast setup for my tjs triangulated rear? I was thinking Ill just cut about 4"s off the cat intake side of the exhaust and moving the cat and then getting a smaller muffler so that itll all fit under the transfer case skid. I really dont wanna make a whole drawn out setup under the rear of the jeep. (Im keeping the 02 sensor in there) Also what consequences will I run into of doing it this way.
Thanks for the help in advance.
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Old 08-21-2011, 04:19 PM   #2 (permalink)
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Check out spin tech. I just installed one on mine that is 4x6x12". They have smaller ones as well. Sounds good and really quiet at idle considering the size.
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Old 08-21-2011, 06:43 PM   #3 (permalink)
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Quote:
Originally Posted by Ezalycasaid View Post
I have my muffler off of my tj right now and I hate that my jeep sounds like a damn ricer. I want it to sound like it did stock, or close to it. What are my options for a shorter exhuast setup for my tjs triangulated rear? I was thinking Ill just cut about 4"s off the cat intake side of the exhaust and moving the cat and then getting a smaller muffler so that itll all fit under the transfer case skid. I really dont wanna make a whole drawn out setup under the rear of the jeep. (Im keeping the 02 sensor in there) Also what consequences will I run into of doing it this way.
Thanks for the help in advance.
I don't know about the consequences of moving the CAT.

However have you considered a resonator (glass pack) rather than a muffler?
It will sound slot less like a "ricer" and fit in the " near stock" location.

I'm running a resonator and I don't mind the sound at all. But then again I didn't build it to sound cool
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Old 08-21-2011, 07:06 PM   #4 (permalink)
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i have seen spintech used before.i know a few guys who moved the cat forward and are running a decent glasspack.sounds decent not too loud and tucks up nice.if you find a good exhaust guy he can run it tight to the frame and theres no issues with clearance.
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Old 08-21-2011, 07:31 PM   #5 (permalink)
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Flowmaster Hushpower is what I just installed on my wife's TJ. It sounds good. Decently quite, still has a nice tone. Plenty of room for the install.

I'll try to get a picture from underneath with it installed.

I just hacked the flange off of the stock muffler and welded it onto the new one. That and a single J-bend from Summit was all I needed.



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Old 08-21-2011, 09:45 PM   #6 (permalink)
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Quote:
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I don't know about the consequences of moving the CAT.

However have you considered a resonator (glass pack) rather than a muffler?
It will sound slot less like a "ricer" and fit in the " near stock" location.

I'm running a resonator and I don't mind the sound at all. But then again I didn't build it to sound cool
Do u still keep a decent amount of back pressure with the resonator so that u dont lose any low end torque?
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Old 08-21-2011, 09:49 PM   #7 (permalink)
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with the 4cyl tj went from a stock muffler to a glasspack there was no noticible torque loss.i have never felt a torque loss running anykind of exhaust honestly.that hushpower looks like a nice unit though im gonna look into something like that for my next exhaust on a jeep
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Old 08-23-2011, 07:47 AM   #8 (permalink)
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Originally Posted by Ezalycasaid View Post
Do u still keep a decent amount of back pressure with the resonator so that u dont lose any low end torque?
when you mean back pressure and torque- you are talking about whats called scavenging - the inline6 doesnt require as much scavenging due to the position and firing order of the cylinders.

Its a naturally torquey engine already.

***wait wait wait - before all the other engine builders go ape shit- all I am saying is that the because the pistons are on axis with one another your torque curve is smoother by design, and a small loss of back pressure isnt going to be noticed "seat of the pants".

The design of the exhaust is pretty restrictive anyway.

Drag racers used to use an inline6 with wide open exhaust...
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Old 08-23-2011, 12:08 PM   #9 (permalink)
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X10 on Spintech.
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Old 08-23-2011, 07:42 PM   #10 (permalink)
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had a spintech on my 4.0, sounded river when you got on it, didn't like that. I didn't buy it (on when I bought it) so I don't know what model it was but it was small.

I am in the same boat right now, figuring ill with just keep running open cat, or tuck something small up under the skid right behind the cat. there isn't any real way to get it to the back anymore.
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Old 08-25-2011, 10:59 AM   #11 (permalink)
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Here is a video from last weekend to hear the Spintech on my 4.2.
Carey JT Rocks 2011 raw video - YouTube
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Old 08-25-2011, 05:05 PM   #12 (permalink)
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I personally like the way my borla sounds on my jeep4.0L, it's got a nice deep mello tone.
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Old 08-25-2011, 08:35 PM   #13 (permalink)
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The second page of my build has my exhaust ran around the 4 link. I used a spin tech muffler. I scoured the internet before building it and this seemed to work the best for people. So far I like the set up... see my build link below --
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[url]www.metalhavoc.com[/url]

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Old 08-25-2011, 09:45 PM   #14 (permalink)
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my only issue i had with spintec is that my dd tow rig only lasted 2 years with a spintec before it rotted out from the inside.for the price i paid i wasnt to thrilled
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Old 08-26-2011, 09:27 PM   #15 (permalink)
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It has a lifetime warranty. I live in Seattle so if rust is an issue it will happen very quickly. I'll just wait and see. Sounds good and tucks up nicely.
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Old 08-31-2011, 09:13 PM   #16 (permalink)
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ok quick question. Why didnt mine come with a flange on the cat or the muffler?
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Old 08-31-2011, 10:54 PM   #17 (permalink)
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sounds like whoever did the exhaust on it now made a "custom" exhaust.we have a few shops like that around here they weld it front to back makes it suck when you need to get the exhaust out of the way for repairs. i usally cut it and get a 2 bolt flange and weld it on.
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